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x/sys/unix: add support for O_TMPFILE in Linux

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Since Linux 3.11, O_TMPFILE flag can be used in open syscall to create
an unnamed file in a directory. The file occupies space in the
filesystem, and can be given a name using linkat syscall. If the file is
closed without being given a name, its contents are deleted.

See the manpage open(2) in Linux for details.

Exports O_TMPFILE for Linux in 386 and amd64 (other architectures
already had it). Exports Linkat syscall and AT_SYMLINK_FOLLOW (used for
giving a name to the file) for all Linux in all architectures.

Fixes golang/go#7830.

Change-Id: Ib82e44f405b227e227b9cbf317c2657b32e046f5
Reviewed-on: https://go-review.googlesource.com/21003
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Caio Marcelo de Oliveira Filho
2016-03-22 23:15:03 +00:00
committed by Brad Fitzpatrick
parent 9d4e42a206
commit 23999e87b4
20 changed files with 24 additions and 13 deletions
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unix/zerrors_linux_amd64.go
+1
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@@ -826,6 +826,7 @@ const (
O_RDWR = 0x2
O_RSYNC = 0x101000
O_SYNC = 0x101000
O_TMPFILE = 0x410000
O_TRUNC = 0x200
O_WRONLY = 0x1
PACKET_ADD_MEMBERSHIP = 0x1